refactor: simplify source code && update defaults (#63)

 - `produceSourceMap` is now on by default & must be explicitly
disabled if so desired

.travis.yml

@@ -1,23 +1,37 @@
 sudo: false
+dist: trusty
 language: node_js
 branches:
   only:
     - master
-matrix:
+jobs:
   fast_finish: true
+  allow_failures:
+    - env: WEBPACK_VERSION=canary
   include:
-    - os: linux
-      node_js: '8'
-      env: WEBPACK_VERSION="2.6.0" JOB_PART=lint
-    - os: linux
-      node_js: '4.3'
-      env: WEBPACK_VERSION="2.6.0" JOB_PART=test
-    - os: linux
-      node_js: '6'
-      env: WEBPACK_VERSION="2.6.0" JOB_PART=test
-    - os: linux
-      node_js: '8'
-      env: WEBPACK_VERSION="2.6.0" JOB_PART=coverage
+    - &test-latest
+      stage: Webpack latest
+      node_js: 6
+      env: WEBPACK_VERSION=latest JOB_PART=test
+      script: npm run travis:$JOB_PART
+    - <<: *test-latest
+      node_js: 4.3
+      env: WEBPACK_VERSION=latest JOB_PART=test
+      script: npm run travis:$JOB_PART
+    - <<: *test-latest
+      node_js: 8
+      env: WEBPACK_VERSION=latest JOB_PART=lint
+      script: npm run travis:$JOB_PART
+    - <<: *test-latest
+      node_js: 8
+      env: WEBPACK_VERSION=latest JOB_PART=coverage
+      script: npm run travis:$JOB_PART
+      after_success: 'bash <(curl -s https://codecov.io/bash)'
+    - stage: Webpack canary
+      before_script: npm i --no-save git://github.com/webpack/webpack.git#master
+      script: npm run travis:$JOB_PART
+      node_js: 8
+      env: WEBPACK_VERSION=canary JOB_PART=test
 before_install:
   - 'if [[ `npm -v` != 5* ]]; then npm i -g npm@^5.0.0; fi'
   - nvm --version
@@ -26,7 +40,7 @@ before_install:
 before_script:
   - |-
     if [ "$WEBPACK_VERSION" ]; then
-      npm i --no-save webpack@^$WEBPACK_VERSION
+      npm i --no-save webpack@$WEBPACK_VERSION
     fi
 script:
   - 'npm run travis:$JOB_PART'

appveyor.yml

@@ -0,0 +1,28 @@
+branches:
+  only:
+    - master
+init:
+  - git config --global core.autocrlf input
+environment:
+  matrix:
+    - nodejs_version: '8'
+      webpack_version: latest
+      job_part: test
+    - nodejs_version: '6'
+      webpack_version: latest
+      job_part: test
+    - nodejs_version: '4.3'
+      webpack_version: latest
+      job_part: test
+build: 'off'
+matrix:
+  fast_finish: true
+install:
+  - ps: Install-Product node $env:nodejs_version x64
+  - npm install
+before_test:
+  - cmd: npm install webpack@%webpack_version%
+test_script:
+  - node --version
+  - npm --version
+  - cmd: npm run appveyor:%job_part%